package com.mmd.gateway.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;
import java.util.ArrayList;
import java.util.List;

@Primary
@Configuration
public class SwaggerResourceProvider implements SwaggerResourcesProvider {

    @Autowired
    private RouteLocator routeLocator;
    @Autowired
    private GatewayProperties gatewayProperties;

    //接口地址
    private static final String API_URI = "/v2/api-docs";

    @Value("${knife4j.production}")
    private boolean production;

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        if(!production){
            List<String> routes = new ArrayList<>();
            routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
            gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                    .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                            .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                            .forEach(predicateDefinition -> resources.add(swaggerResource((String) routeDefinition.getMetadata().get("alias"),
                                    predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                            .replace("/**", API_URI)))));
        }
        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("1.0");
        return swaggerResource;
    }
}
